Hi, did you solve this problem? I have exactly the same case and before you ask for it: I do never give admin site account access to anyone. If the problem is not solved I will open an own thread, I don't want to highjack this one here.
The problem with using %post_id% is on posts (not pages or cpt). On posts the URL has a number domain.com/123 <- I would like to see the postname. But if I choose %postname% posts-URLs are fine, but then cpt-pages show "This page does not exist".